<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .shapeClass {
            width: 80px;
            height: 40px;
            border-radius: 5px;
        }
        .colorClass {
            background-color: aqua;
            color:black;
            border: 3px solid red;
        }
        .fontClass {
            font-size: 20px;
            font-family: '隶书';
            line-height: 30px;
        }

    </style>
</head>
<body>
    <input type = "button" class="shapeClass colorClass" value = "按钮1" />
    <input type = "button" class="fontClass colorClass" value = "按钮2" />
    <input type = "button" class="fontClass colorClass shapeClass" value = "按钮3" />
</body>
</html>